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Bologna Bottle

Bologna Bottle

A Bologna bottle is a type of glass container with high external strength but fragile interior, created through rapid cooling on the outside and slow cooling inside during manufacturing. It is used mainly in magic tricks and demonstrations due to its unique stress properties, making it both durable externally and easily shattered internally. (en.wikipedia.org)

The daily digest

Today's best Hacker News stories, summarized and screenshotted, one email a day.